156 The Gulls uf Essex. 



Pemphigus, Hartig. 

 P. BURSARius, Hart. Gall on Populus, Generally distributed, 



but not common. 

 P. spiKOTHEC.E, Koch. Gall on Populus. Heybridge, Maldon, 



Eayleigli. 



Tetraneura, Hartig. 

 T. Ulmi, DeGeer. Gall on Ulmus. Generally distributed, 

 but not common. 



Adelges, Vallot. 

 A. Abietis, L. Gall on Abies. Common. 



[The whole of the cuts of Oak-galls illustrating this 

 paper were kindly lent by Messrs. West, Newman & Co. 

 The Editor is indebted to Miss Ormerod for the cuts of 

 Cecidomym Ranunculi and Ceutlwrhynchus sulcicolUs. The 

 remaining blocks were engraved expressly for this paper. 

 —Ed.] 



